debuild makes both the binary and source packages. It's nice for presenting the whole picture to someone trying to follow along later. debuild uses dpkg-source to generate a diff between the vendor's source package and the source tree used in the actual debian build. dpkg-source uses your diff which probably comes from diffutils-2.8.1 which was the last release in 2002 (http://ftp.gnu.org/pub/gnu/diffutils/).

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It took me a couple of years to get BOM support into PPI. It frustrates me that we still have to fight basic battles like this. The Java world has it pretty good, with Unicode from day 1. I hope Parrot/Rakudo does that well.